Closed
Description
I tried this code:
#![feature(const_trait_impl, const_fn)]
pub trait MyTrait {
fn method(&self);
}
impl const MyTrait for std::convert::Infallible {
#[inline(always)]
fn method(&self) {
match *self {}
}
}I expected to see this happen: Report an error in compilation which tells me that I need #![feature(const_if_match)]. If that feature is enabled, this ICE DOESNT happen.
Instead, this happened: This ICE
Meta
rustc --version --verbose:
1.43.0-nightly (d3c79346a 2020-02-29)
Backtrace
warning: the feature `const_trait_impl` is incomplete and may cause the compiler to crash
--> src/lib.rs:1:12
|
1 | #![feature(const_trait_impl, const_fn)]
| ^^^^^^^^^^^^^^^^
|
= note: `#[warn(incomplete_features)]` on by default
error: internal compiler error: complex control flow is forbidden in a const context
--> src/lib.rs:9:5
|
9 | / fn method(&self) {
10 | | match *self {}
11 | | }
| |_____^
thread 'rustc' panicked at 'no errors encountered even though `delay_span_bug` issued', src/librustc_errors/lib.rs:355:17
stack backtrace:
0: backtrace::backtrace::libunwind::trace
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.44/src/backtrace/libunwind.rs:86
1: backtrace::backtrace::trace_unsynchronized
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.44/src/backtrace/mod.rs:66
2: std::sys_common::backtrace::_print_fmt
at src/libstd/sys_common/backtrace.rs:78
3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
at src/libstd/sys_common/backtrace.rs:59
4: core::fmt::write
at src/libcore/fmt/mod.rs:1053
5: std::io::Write::write_fmt
at src/libstd/io/mod.rs:1428
6: std::sys_common::backtrace::_print
at src/libstd/sys_common/backtrace.rs:62
7: std::sys_common::backtrace::print
at src/libstd/sys_common/backtrace.rs:49
8: std::panicking::default_hook::{{closure}}
at src/libstd/panicking.rs:204
9: std::panicking::default_hook
at src/libstd/panicking.rs:224
10: rustc_driver::report_ice
11: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:474
12: std::panicking::begin_panic
13: <rustc_errors::HandlerInner as core::ops::drop::Drop>::drop
14: core::ptr::drop_in_place
15: <alloc::rc::Rc<T> as core::ops::drop::Drop>::drop
16: core::ptr::drop_in_place
17: rustc_interface::interface::run_compiler_in_existing_thread_pool
18: syntax::attr::with_globals
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
note: rustc 1.43.0-nightly (d3c79346a 2020-02-29) running on x86_64-unknown-linux-gnu
note: compiler flags: -C codegen-units=1 -C debuginfo=2 --crate-type lib
note: some of the compiler flags provided by cargo are hidden
query stack during panic:
end of query stack
error: could not compile `playground`.